One-dimensional air temperature measurements by air resonance enhanced multiphoton Ionization thermometry (ART)

McCord, Walker; Clark, Aleksander; Zhang, Zhili

doi:10.1364/OE.455572

Title: One-dimensional air temperature measurements by air resonance enhanced multiphoton Ionization thermometry (ART)

Journal Article · Thu May 12 00:00:00 EDT 2022 · Optics Express

DOI:https://doi.org/10.1364/OE.455572· OSTI ID:1867529

; Clark, Aleksander; Zhang, Zhili

In this work, a detailed calibration study is performed to establish non-intrusive one-dimensional (1D) rovibrational temperature measurements in unseeded air, based on air resonance enhanced multiphoton ionization thermometry (ART). ART is generated by REMPI (resonance enhanced multi-photon ionization) of molecular oxygen and subsequent avalanche ionization of molecular nitrogen in a single laser pulse. ART signal, the fluorescence from the first negative band of molecular nitrogen, is directly proportional to the 2-photon transition of molecular oxygen C ³ Π (v = 2) ← X ³ Σ (v’=0), which is used to determine temperature. Experimentally, hyperfine structures of the O ₂ rotational branches with high temperature sensitivity are selectively excited through a frequency-doubled dye laser. Electron-avalanche ionization of N ₂ results in the fluorescence emissions from the first negative bands of N ₂ ⁺ near 390, 425, and 430nm, which are captured as a 1D line by a gated intensified camera. Post processing of the N ₂ ⁺ fluorescence yields a 1D thermometry line that is representative of the air temperature. It is demonstrated that the technique provides ART fluorescence of ∼5cm in length in the unseeded air, presenting an attractive thermometry solution for high-speed wind tunnels and other ground test facilities.

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Research Organization:: Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: SC0021382.; SC0021382; NSF-2026242

OSTI ID:: 1867529

Alternate ID(s):: OSTI ID: 1980979

Journal Information:: Optics Express, Journal Name: Optics Express Vol. 30 Journal Issue: 11; ISSN 1094-4087

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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